Re: [PATCH] usb: host: Faraday fotg210-hcd driver

[Yuan-Hsin Chen]

Hi,

On Tue, Jun 18, 2013 at 11:07 AM, Sarah Sharp
<sarah.a.sharp@xxxxxxxxxxxxxxx> wrote:
> On Tue, Jun 18, 2013 at 10:42:09AM +0800, Yuan-Hsin Chen wrote:
>> Hi,
>>
>> On Tue, Jun 18, 2013 at 4:39 AM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
>> > On Wed, Jun 05, 2013 at 05:15:43PM +0000, Yuan-Hsin Chen wrote:
>> >> FOTG210 is an OTG controller which can be configured as an
>> >> USB2.0 host. FOTG210 host is an ehci-like controller with
>> >> some differences. First, register layout of FOTG210 is
>> >> incompatible with EHCI. Furthermore, FOTG210 is lack of
>> >> siTDs which means iTDs are used for both HS and FS ISO
>> >> transfer.
>> >>
>> >> Signed-off-by: Yuan-Hsin Chen <yhchen@xxxxxxxxxxxxxxxx>
>> >> ---
>> >>  drivers/usb/Makefile           |    1 +
>> >>  drivers/usb/host/Kconfig       |   12 +
>> >>  drivers/usb/host/Makefile      |    1 +
>> >>  drivers/usb/host/fotg210-hcd.c | 5967 ++++++++++++++++++++++++++++++++++++++++
>> >>  drivers/usb/host/fotg210.h     |  746 +++++
>> >>  5 files changed, 6727 insertions(+), 0 deletions(-)
>> >>  create mode 100644 drivers/usb/host/fotg210-hcd.c
>> >>  create mode 100644 drivers/usb/host/fotg210.h
>> >
>> > You obviously didn't even run this through checkpatch.pl, did you?
>> >
>> > $ ./scripts/checkpatch.pl --terse ../usb.mbox | tail -n 1
>> > total: 138 errors, 618 warnings, 6742 lines checked
>> >
>> > Please fix all of these if you wish us to at least start reviewing the
>> > patch.  Your internal Q/A should have caught this first, please be more
>> > careful in the future.
>> >
>>
>> Actually I did run checkpatch.pl and found that almost all errors and
>> warnings are from ehci core (ehci-hcd.c, ehci-hub.c and so on) where
>> my driver borrowed most of code.
>>
>> $ ./scripts/checkpatch.pl --terse -f drivers/usb/host/ehci-hub.c | tail -n 1
>> total: 18 errors, 69 warnings, 1138 lines checked
>>
>> $ ./scripts/checkpatch.pl --terse -f drivers/usb/host/ehci-hcd.c | tail -n 1
>> total: 17 errors, 78 warnings, 1403 lines checked
>>
>> So you're saying that I should fix them, is that right?
>
> In that case, no, you should be figuring out how to refactor and reuse
> the EHCI code instead of copying it straight into your driver.

I was trying to use ehci-platform.c, anonymous union/struct, and quirk
flags to avoid copying EHCI code.
But there are too big incompatibilities between fotg210/fusbh200
controller and EHCI.
That's why Alan agreed that I could create a stand-alone driver for
fusbh200 host controller.
Since fotg210 and fusbh200 have the same issue,  fotg210 hcd is
supposed to be stand-alone.
More details please refer to mail sequence
http://www.spinics.net/lists/linux-usb/msg83812.html

Thanks,

Yuan-Hsin

>
> Sarah Sharp
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